No, but thinking that technical knowledge for building trailer is based on whether or not you are the company founder is not either.
I have seen Eby’s production facility, and know that they use very up to date and well respected technology when building their trailers. I also know that many, many ranchers use their trailers because they are built “bull strong”. I know first hand that nothing can destroy any piece of farm equipment like a bull! They do it just for fun!
There are many good, if not great, trailer companies out there, that make well built, safe trailers that last many years, especially if the owner makes the effort to take care of them.
One shouldn’t limit their search to someone who has been in business since the 1960s. Actually, with technology these days, especially with college majors specifically targeted to industries like welding and metal fabrication, one might think a newer company would be more open to changes in the industry.